B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL

B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape

B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes

B21C37/15—Making tubes of special shape; Making tube fittings

B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces

B21C37/29—Making branched pieces, e.g. T-pieces

B21C37/294—Forming collars by compressing a fluid or a yieldable or resilient mass in the tube

B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces

B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure

B21D26/033—Deforming tubular bodies

B21D26/037—Forming branched tubes

Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC

Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

Y10T83/00—Cutting

Y10T83/04—Processes

Y10T83/0591—Cutting by direct application of fluent pressure to work

Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

Diese Aufgabe wird in verfahrensmäßiger Hinsicht dadurch gelöst, daß durch den den sich während des Umformens aus bildenden Dom abstützenden Gegenhalter bei gegenüber dem maximalen Fertigungs- Innendruck erhöhtem Innendruck die Domkappe ausgestanzt wird. This object is achieved in terms of method, characterized in that through which the Domkappe is punched to be supported during the forming of dome-forming counter-holder with respect to the maximum production inner pressure increased internal pressure.Der Erfindung liegt hierbei die Überlegung zugrunde, den üblicherweise nur der Abstützung des Doms dienenden Gegenhalter bzw. -stempel gleichzeitig auch zum Ausstanzen der Domkappe zu verwenden. The invention herein is based on the consideration that typically serving only the support of the mandrel or anvil to use punches at the same time of punching out the Domkappe.Ein zusätzlicher Arbeitsgang ist nicht mehr notwendig, denn das Ausstanzen der Domkappe findet sogleich in dem Innenhochdruck-Umformwerkzeug statt, das nach dem Aufweit- Stauchvorgang auch nicht geöffnet wird. An additional operation is no longer necessary, because the punching of Domkappe is once held in the internal high pressure forming tool, which is not open after reaming upsetting process.

Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus den Patentansprüchen und der nachfolgenden Beschreibung, in der ein Ausführungsbeispiel des Gegenstandes der Erfindung näher erläutert ist. Further details and advantages of the invention emerge from the patent claims and the following description in which an embodiment of the object of the invention is explained in more detail.Es zeigen: Show it:

Cutting into a hollow pipe has a medium pressure within the pipe while the cutters pass through the workpiece wall and a support body takes up the detached section to give sharp-edged geometry to the cut edges

Method, for shaping additional element at a closed hollow profile, uses high inner fluid pressure within it to force the mantle into a shaped branch cavity while supported externally by an elastic membrane under pressure

Cutting into a hollow pipe has a medium pressure within the pipe while the cutters pass through the workpiece wall and a support body takes up the detached section to give sharp-edged geometry to the cut edges

Production of an elongated hollow body comprises roller profiling and deforming a basic body using an internal high pressure deformation process allowing controlled material flow to produce a fixed flange